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Thanks for the update. It will be Sat Afternoon before I can start looking at the values & numbers in your circuit. I have some other pressing work tomorrom; sleep too.
I was wondering. Could this be made to detect above 15vdc and below 11vdc ? Here is why I ask as this would be good numbers...
This Schematic is the pre-development of the proto-type. It will be scaled back as functions are replaced by the Spark Core MCU via Software Control.
Its a work in progress and all comments are welcome. What else needs to be detected beyound Ring & Off Hook state ?
I worked in Iowa & Oklahoma where "Contrators" are allowed to service phone lines and repair them. It does not happen much but, connections in vaults and field cans do get crossed. Sure, they are suppose to make sure but, it does not always happen. 300+ group cable being put back together...
moffy, That update or your design is awesome and I need to think about it a lot tomorrow.
Then come back with an idea to run by you on how to get your Off Hook Detection circuit in to my current Schematic for testing.
Then 2nd run testing using your Ring Detector (replacing my design)...
moffy, your absolutely correct - I got the DIAC function reversed and it won't work and Thanks for updating your schematic to include what I was beating my head on the wall about today. Off Hook State :) !!
I will incorporate your circuit in to my updated schematic below tomororw after I look...
I have a question ?
Can't I use a 20V diac ? (To allow a phone call to be isolated from the phone Company as On Hook volage is 48V (blocking Call) When Answered phone line voltage dropps to arounr 6-10vdc and will remain until hung up; returning to 48VDC diconnecting the Diac.
Phone...
I did some research on the Saturable Core Transformer can could not find one locally or even on line that was smaller than the size of a car battery. And, I also checked Google Patents and someone has the patend on this techology. So with frustration comes options to open new doors.
I think I...
Hello Again KeepItSimpleStupid and moffy,
I did some research on the Saturable Core Transformer can could not find one locally or even on line that was smaller than the size of a car battery. And, I also checked Google Patents and someone has the patend on this techology. So with frustration...
Hi KeepItSimpleStupid, I agree with moffy & 4pyros about the DC not being detected by EMF induction methods.
What I am trying to do is create a non-contact EMF inductive pickup "Trip Circuit" if you will that I can determine "OFF HOOK" and "RING".
Your specs are very close as you state for the...
4pyros - Hi and Thanks for your comment.
I can't use a contact to the phone line type circuit. The circuit of my board is non-contact and seems to be the beginings of where I want to end up. I am trying to understand how when -48VDC is applied to the phone line, how my board can picked that...
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